Jack for nailing and slugging machines.



v W. H. CUFF. JACK FOR NAILING AND QLUGGING MACHINES. I

APPLIUAIION FILED JUNE 20,1899.

Patented Apr. 27, 1909.

2 sHnnTs -snnnT 1.

PETER-SE01; WAsHlNamR; 173v W. H. CUFF. JACK FOR NAILING AND SLUGGING MACHINES APlLIUATIONv FILED JUNE 20,1899.

2 SHEETS-SHEET 2.

Patented Apr. 27, 1909.

'rn Nu'mls PETERS cm, wAsnmsrmv, n c.-

'h TATES PATENT OFFICE WILLIAM H. ours; or BRAINTREE, nassaoncsnrrs, ASSIGNOR, BY MESNE ASSIGNMENTS,

TO UNITED SHOE MACHINERY COMPANY, A CORPORATION OF NEW JERSEY.

JACK FOR MAILING AND SLUGGING MACHINES.

sole of a shoe to the lasted shoe with metallic or other suitable fastenings before the last is withdrawn from the upper. Frequently, also, spring and other heels are secured. to the upper and inner sole while the last is still within the shoe,'and these heels when so secured are often thereafter slugged or otherwise provided with protectors or ornamentation while the shoe is still on the last. In successfully perfo aning any of tl operations, before the last is withdrawn from the shoe, it has been found advantageous to mount the last on a jack-spindle provided with suitable means to engage and retain the last thereon.

This invention herein to be described relates to a jack of this class, and has for its object the production of an improved jack to sustain the lastduring any of the operations referred to.

The machine in which the jack herein to be described is commonly used has a stationary foot-plate or presser-plate, the under side of which occupies a substantially horizontal position, and said foot-plate has cooperating with it an edge gage preferably adjustable so that the line of nailing or slugging may be properly defined at the desired distance from the edge of the stock in which the nails, fastenings, or slugs are to be driven The last carrying the shoe, a part of which is to receive the nails, fastenings or slugs, has a hole which is entered, as herein provided for, by a last-pin, represented as entering looselya socket in a lastpin holder, which may be mounted in an adjustable'manner on the upper end of a socalled jack-spindle the lower end of which terminates in a rocking foot, preferably pivoted to the spindle, and free to tip on a rocker-bed the shank of which enters a hub extended from and forming preferably a part of the jack frame sustained by any Specification of Letters Patent.

Application filed. June 20, 1899.

Patented April 27, 1909.

Serial No. 721,203.

usual horn-shaft, the latter being preferably supported in a yielding manner as common to nailing and slugging machines. Means are provided for adjusting the rocker-bed and the spindle vertically. In the preferred construction the shank of the rocker-bed is passed through a bed-lifting cam sustained loosely by the jack-frame, and the lower cam shaped end of a projection depending from the rocker-bed rests on the top of the said bed-lifting cam, and said shank below the hub through which it is extended is provided with a depressing spring. The bedlifting cam is provided with a handle carrying a movable locking pawl or device which cooperates with teeth of the jackframe so that by turning said bed-lifting cam in one or the other direction the rockerbed may be elevated or depressed, as desired. to thereby adapt the jack to lasts of different sizes. The last-pin holder is preferably pivotally mounted upon the upper end of the jack-spindle, and means are provided for adjusting said holder to any desired degree of inclination relative to the foot plate. As herein represented the lower end of said holder is provided with worm teeth which are engagedby the teeth of a worm screw, slotted at its end so that it may be engaged by a screw driver.

It is advantageous that the movable support for the last-pin holder be relieved of strain as .much as possible during the operation of the machine, and to this end means independent of the movable support are provided which may be quickly adjusted in position and give the relief desired. In the preferred construction for effecting this result the worm screw is sustained, at its side opposite the worm teeth of the last-pin holder, in a concavity of a movable block having cooperating with it an adjusting device shown as a screw, the movement of which causes proper contact of the body of the screw with the worm toothed end of the said last-pin holder.

The rocking foot referred to as mounted on the rocker-bed is preferably toothed at its underside and the surface of the rocker bed is preferably toothed throughout. The central portion of the rocking foot is herein represented as shaped to present a face lying in a chord to the circle in which are presented the crowns of the teeth att'he opposite V I V t V v a ends of the rocking foot, so that by reason of such construction of said rocking foot the top of the last-pin or holder is main- 1 tained in substantially the same horizontal plane whether the jack is held in its normal vertical position or whether the top of the cl: is moved to a position toward or away iron! the machine and at the same time to the right or left of its normal position, a position which has to be assumed when any aart of the heel is being nailed except the middle oi? the heel, the spindle standing in its normal position only when the rear part 01": the heel is being nailed or slugged.

(,ne of the chief objects of the improvement herein. to be described is so to mount the jack-spindle carrying the last that in the operation of driving a series of nails, 'lastenings or slugs into the stock supported by the last, the upper surface of the stool; may always be maintained in substantially ti 2 same horizontal plane in contact with the underside of the toot-plate referred to.

The last-pin usually enters loosely the hole in the last, and during the nailing oi": the heel the pressure thereon is between the toot plate and t .e last-pin and consequently the last will be tipped on the pin and the edge of the heel. being nailed might tip suiiic-iently to incline the points of the nails outwardly, and to overcome this undue tipping of the heel. the last pin is tipped on the spindle, this t ipping being more or less according to size of the heel, it being less with small than with large heels, and the degree of the tip required varies with different manufacturers as some desire to beat down the outer edge oi? the heel while itis being nailed in order to force the lifts of the heel more closely together and obviate cracks in the heel. l Vhen the tipping of the last to insnr this beating down of the heel edge is considered necessary, or whenever the tipping desired is more than the average then I find it advisable to cut off more of the bottom of the rocking foot, that is make the chord longer than is necessary to insure the last being always maintained, as hereinieiore explained, in a substantially horizontal position. The lengthening of the chord enables me to compensate for the upward tipping oi? the rear or heel end of the last that occurs when the last pin is considerably inclined for the purposes stated, and therefore to compensate for this upward tipping during the nailing of the rear iart ot the heel, l, by the increase in the length of the chord am enabled to secure a slightly lower position of the jack when in its normal or vertical position.

h'ileans are provided for preventing the slipping of the rocking-foot longitudinally on the rocker-bed during the operation of presenting the heel end of a shoe to the dri v61 working through the usual toot-plate.

? l preferably eliect this result by providing the rocking foot and the rocker-bed with teeth. \Vith such a construction it is possi ble to always insure an exact position for the toot on the bed whenever the aclr spindle substantiall vertical, and whenev r the nails, :fastenings, or slugs are being driven into the rounded extremity of the heel or sole.

Figure i. represents in side elevation a toot-plate, edge and part of a horn spindle, the latter sustaii'1i11,-;;' .my novel jack. The spindle o't said jack is shown by full. lines in its normal vertical position and as sustaii up; a last carrying a shoe, the last, part of the last-pin holder and. the jack- 'idle being in en away. The spindle,

resented by the dotted lines tit) c-il. an. in position to receive nails aloi .ic side at the heel. jrnother dottedline pr lion oi the shoe represents the latter in pen ill to receive nails in the rear of the hen toe jaclespindle at such time standing in is normal ver ical position. The dotted line ta 'thest to the left represents the posi- 1 (X'LtlPlGtl by the jack-spindle when a la; is to be pla ed on the last pin or reuurved tl'ierettroin. 1 shows a portion oi the l "enioved from the lower and of i I 2 is a diagram showing the end 0; a spr heel in three positions; Fig. 3 represents my unproved ack in frontclcvat-ion, the toll. lines representing the 'ndle in its vertical or normal position I )1 when the nails or slu are being driven into the 'romuled extremity oi" the heel, the dotted line position at the ]'if' it showing the jackspindle in posit ::-n to commence the operation ot iflriving nails or slugs in a heel near the shank of the shoe, the dotted lines at the left showing the spindle in the position it will occupy when the nailing is being fin- 4-. in tnll lines, shows the rockthe jack-spindle sitting on the en. the jack-spindle being in its normal vertical pos tion, the dotted lines shewie reciting ij'oot tipped to occupy the position reipiired for commencing nailing or slugging; Fig. 5 shows the rocking-foot in section in the line a", Fig. ti, it containing the jack-spindle; Fig. 6 shows the toot by itself; and Fi 7 shows the upper end of the last-pin holder in vertical section, and the detacl'iable revolving last-pin therein.

Referring to the drawings, let A represent the usual foot-plate or pii'esser-plato common to nailing machines, and B the usual edge This toot-plate and edge may be substantially the same as rcpresented in U. 9. Patent No. 490621, Jan-- nary 2t, 1893.

The horn spindle (l is and may be of any usual construction, it being sustained by a spring and adapted to he slid up and down in a suitable sleeve D rising from the spr1ng 22 to sustain the horn in a yielding manner nra y be of any usual orsuitable kind, the range of vertical movement or the be kept uniform, and also to partially reinove the strain of the holder on the pin Z). The

spindle under the action of the spring being i usually about an inch or an inch and a quarter in extent.

To the upper end of the spindle (l l have clainpedby suitableclanip screws 0 asplit hub t" ot the jack-frame C having a horizontal extension G with which is fixed a toothed-plate C This plate serves as a support for a sleeve E having its upper surtacec made as. a cam, and provided with a handle 6 having a depending car (2 which receives. a pawl c acted upon by a suitable spring c. said pawlbeing tree to slide in saidear, the pawl having a pin 0", the spring normally keeping the pawl in engagement with. the teeth of the plate C the pawl maintaining the sleeve in its adjusted position. .Yhenit is desired to raise or lower thejack spindle tobe described, the operator will pull out the pin to disengage the pawl from saidtoothed plates C and engaging the handle c will turn the sleeve E to the left in Fig. 1 when its side face (Z will he carried away from the upright edge of the partd of the rocker bed, leaving a space as. indicated at (F and its upper carnshaped face which contacts with the inclined face (Z of the part (Z of the rocker bed raises the rocker bed and spindle. Reverse inoven'ient ot the sleeve permits the rocker bed and sleeve to move downwardly under the action of spring f to be hereinafter described;

The last pin a. sustaining the last F and shoe F has, as herein represented, a shoulder a," and a depending shank 0 provided with an annular groove (13. The shanka is made i posed'ends as at 7), to receive a screw driver by which to rotate the said screw to change thev position of the last-holde and pin vertically to thereby adapt it to the condition of the work to be done. as hereinbetore descriluzd the last requiring ditlerent positions For the ditterent work to be done. ,he unthrea-dedends of the worm screw 5* rest in concavities ot' ears torniingpart ot a block 0 having a shank which acted upon by an a dj usting device c, shown as a screw, the rotation otsaid screw moving the block toward the pivot 7), on the last-pin holder. thereby worm screw with the teeth of the holder to holder has connected with it, by a screw 0 a sprin c" having at its upper end a pin or projetion c which is extended through a hole in the hollow shank of the last-pin li0l(l0l.-*Hfil(l pincr projection entering the notch of in the shank of the last-pin. The pin or projection c prevents the withdrawal ot the last-pin from the last-pin holder in operation, but leaves the shank of the pin tree toturn in the holder with the last during the op ration of turning a shoe about the jack-spindle in. the operation of driving nails. tastenings, or slugs into the heel, it being understood that at times, owing to the position of the j ck andthe condition of the hole in the last, the last pin binds more or less in the hole otthe last.

In practice the crown of the last supported by the shoulc er a of the last-pin. The jack-spindle Z) is bent or ottset substantially opposite the upper end of the sleeve C as shownin Fig. 1, so that the last-pin may occupy a position directly over the upper endot' the horn spindle C, or any position above or with relation to said horn spindle that may be required in moving the last and shoe under the -toot-plate. The lower end of the ack-spindle is provided with an opening 72"". see Fig. 5. which is split, as at b a sin"- able clainp screw 11" extended through threaded holes in said split end enabling it to be clainpediirinly upon a stud 7), which is thus lixed with relation to the'lower end or the jack-spindle and constitutes a pivot for the same, said stud being adapted to turn freely in holes made in suitable ears (Z of the rocking toot If. he rocking toot provided with an elongated opening (Z rests at its lower side upon. as herein-shown, a rockerbed (1* having suitable side walls (1 and (i said side walls being represented as detachable. and as being connected with the rockerbed by bolts d. herein represented as three in number. The opening (Z in the rocking toot is entered by a bolt (1 extended through said side 'alls. theidianieter of said bolt being considerably smaller than the opening (Z so that the rocking'toot may turn and not be bound by the action of the bolt (1, the chief purpose or said bolt being to prevent the accidental lifting of the rocking toot tron; the rocket-bed. The underside of the rocker-bed a projection (1* provided with an incliuedtace (1" which rests upon the inclined or cani shaped face 0 ot the sleeve E. The rocker-bed also hasdepent ing from it a shank fwhich is extendedthrough the sleeve E and through a hole in the toothed plate C and the extension and also through av suitable expansion spring f, the shank fthereafter receiving upon its threaded end a suit-- able nut. as F, the rotation of said nut-0n said shank increasing or decreasing the eft'ective force of the spring f, so that the in- 1 pin thejack-spindle will occupy the dotted clined face {1 of the depending foot (Z see 1, of the rocker-bed may rest firmly upon the upper inclined end of the sleeve it).

It is necessary at times to adjust the jack spindle b vertically more or less to thereby adapt the jack to the depth of the last being used, it being understood that the larger the last the deeper it is from its crown to its sole, and to do this the operator has simply to turn the sleeve E. The sleeve E and the coiiperating inclined face (Z of the rockerbed constitute what I shall hereinafter designate means for varying the vertical position of the jack-spindle, and instead of these particular devices I may employ any other usual device or devices for accomplishing this vertical adjustment, the two faces 0 and (Z constituting practically each a part of opposed screw threads.

The underside of the rocking-foot is represented, see Figs. 3, t, and 6, as provided with blocks of teeth 2, 3, 4 and viewing Fig. +1- it will be noticed that the blocks of teeth marked 2 and 4 are located respectively at the opposite ends of the rocking-foot, and that the crowns of the teeth in said block stand substantially in the are 6 of a circle represented by dotted lines in Fig. 6, but the crowns of the teeth of the central block 3 stand in a line 7 which constitutes a chord to the are 6, so that whenever the block of teeth 3 engages the teeth 10 of the rockerbed, the crowns of the teeth will occupy a position in a substantially horizontal line, and the j ack-spindle will occupy its normal or vertical position, and at such time if nails or slugs are being driven, that they will be driven into the extremity of the heelend. of the boot or shoe. When the jackspindle and its rocking foot are tipped in the direction of the length of said. foot on or with relation to the rocker-bed the top of the last-pin will be kept at substantially the same horizontal level and the blocks of teeth 2 and 4!, one or the other, will be effectually engaged with the teeth of the rocker bed, and under such conditions, the jack-spindle being inclined from a vertical position, the foot cannot possibly slip longitudinally on or with relation to the rocker-bed, hence it always follows, whenever the jack-spindle is in its normal or vertical position with relation to the length of the rocker-bed, that the teeth of the foot always occupy one and the same relation with the teeth of the bed.

Let it be assumed that a spring heel is to be nailed. The last containing the shoe will. be applied to the last -pin in the last-pin holder of the jack-spindle, the last-pin holder having been previously adjusted to give to the last-pin the proper inclination with relation to the axis of the horn spindle C. 'lVhen the lastis so applied to the lastline position at the left in Fig. 1, and the toe of the last may be grasped by the left hand of the operator, the operator standing in front of the j tick-spindle. Preparatory to starting the machine to drive nails or slugs the operator holding the last and shoe in his hand. the last being on the last-pin, will push the last and j ack-spindle into the full line position, Fig. 1, the jack spindle swinging on the stud b as a fulcrum, and then in connection with moving the spindle in that direction he will turn the rocking-foot 0n the rocker-bed thereby adjusting the jack spindle perfectly and at the same time place the side of the heel against the edge gage B, the j ark-spindle at such time occupying the dotted .line position 81, Fig. 1, and the dotted line position at the right of Fig. 8, the shoe ocmuoying the dotted line position 80. This position of the parts puts that portion of the heel marked 72., which terminates in the shank of the shoe, directly under the driver which is to drive the nails or slugs, and with the last and shoe in such position the operator will start the machine, and as the nails or slugs are driven one after another he will gradually move the jack-spindle from its dotted line position at the right in Figs. 1 and 3 into its full line position, the operator during such movement also turning the shoe gradually on the last-pin in the direction of the arrow Fig. 2. As the j ack-spindle comes into the full line position, Figs. 1 and the nailing or slugging arrives at the rounded extremity of the heel, or the shoe is brought into the dotted line position 83, see Fig. 1, and the rounded end having been nailed or slugged, and the side 71 of the heel having been brought against the edge gage B the operator will gradually again move the jack-spindle from the full line positions Figs. 1 and 3 into the dotted line position, Fig. 1, and will continue the movementof the jack-spindle b from the full line position, Fig. 3 into substantially the dotted line position at the left in said figure, the rocking foot completing its tipping stroke upon the rocker-bed, thereby enabling the last and shoe to be moved substantially horizontally in contact with the underside of the foot-plate. The nailing or slugging .is completed as the heel comes into the position 7L3, Fig. 2, and the jack-spindle is permitted to again resume its normal vertical position and to turn outwardly into the dotted line position at the left of Fig. 1 when the last and shoe may be removed.

ly reason of the shape of the rocking foot sustained on the rocker-bed it is possible that the spindle may be moved during the nailing or slugging operation in the direction to rock the foot on said bed, and the last during such movement will be mainta-ined and moved substantially in the same horizontal plane while the nails or slugs are being driven. In other words the rocking surface of the member (Z is so constructed that it compensates not only for the lowering of the spindle by tipping toward the machine about the pivot pin 6 but also for such lowering as would have taken place as a result of the tipping of the spindle in a di rection at right angles to the before mentioned tipping, had the rocking foot been given a. curve corresponding to an arc of a circle.

This invention is not in all cases to be limited to the use of teeth in the rockerfoot, or in the bed, yet the teeth are preferable as they prevent any longitudinal motion of the foot on the bed, and also aid greatly in relieving strains of the outer sides of the rocking foot against the inner sides of the plates (Z and cl rising from the rocker-bed.

Under the term rocking-foot and rockerbed I mean to include a foot presenting a convexed face for more or less of its length, such foot standing on a. substantially horizontal bed, or the foot and bed will be so shaped, one with relation to the other, that as the foot is tipped or rocked on the bed it will retire from contact with one part of the bed and engage another part thereof, this operation being effected as the foot is tipped to and fro on the bed in the oper ation of nailing or slugging.

In this machine the circle bounding the are occupied by the ends of the rocking-foot is struck from a center substantially at the surface of the heel end of the last.

This invention is not limited in all instances to the use of the chord at the underside of the rocker foot, for in some cases with a long jack good results may be obtained by the use of a foot the entire under surface of which is in an arc of a circle.

Having described the invention what I claim as new and desire to secure by Letters Patent is 1. In a jack, a bed, a rocking-foot having a curved underside sustained by and adapted to rock on said bed, and a, jack-spindle joined to said foot and extending therefrom in a direction approximately radial to the curved underside of said foot.

2. The combination with a sustaining bed, of a jack spindle having a tipping movement in one direction and provided with a foot having a curved underside resting on said. bed upon which the spindle may rock in another direction, the contour of said curve being such that the upper end of the spindle will move in a substantially horizontal plane during the normal operative movement of the spindle.

3. A rocking-foot and a radial ack-spindle pivotally mounted thereon, combined with a bed to sustain the underside of said rocking-foot, and means for preventing sliding movement of said footrelatively to said bed.

t t. A jack-spindle mounted upon a rocking-foot having its underside shaped to present end portions lying in the arc of a circle, the middle portion of the foot being shaped to present a chord to said are, and a rockerbed to sustain said foot, substantially as described.

5. A jack-spindle and a rocking-foot carrying it, said foot presenting at its opposite ends blocks of teeth the crowns of which occupy a position in an arc of a circle, the central portion of said foot between said toothed portions presenting a surface occu pying the position of a chord intersecting the are occupied by the crowns of the teeth referred to, and a rocker-bed to sustain said rocking foot. substantially as described.

6. A jack having a toothed rocker-bed, and having a jack-spindle with a toothed rocking foot arranged to engage and rock upon said rocker-bed and shaped to cause the top of the jack to move in a substantially straight line when the jack is rocked.

T. A jacltspindle having a foot presenting the opposite ends of its lower side in an arc of a circle and provided with a slot, combined with a rocker-bed having side walls, and a bolt inserted through said side walls and the slot of said foot, substantially as de scribed.

S. In a jack, a rocker-bed, a rocking-foot sustained on said bed, said foot rolling from end to end on said bed during changing positions of the spindle, a jack-spindle jointed at its lower end to said rocking-foot centrally between its ends, and means to adjust said rocker-bed, foot and spindle vertically.

9. A. jack-spindle bored and split at its lower end, a stud inserted in the bore of said jack-spindle, a clamping device to clamp said stud in said lower end, and a rockingfoot to sustain said stud loosely that it may tip therein: combined with a rocker-bed upon which said foot rests and is free to turn as the spindle is tipped to properly present the last and shoe in position for the shoe to receive nails or slugs, substantially as described.

10. in a nailing machine, a jack-spindle having an attached curved rocking foot, and a bed on which the foot rocks, said foot being shaped to cause the top of the jack to move in a substantially horizontal path and said spindle being movable transversely to the line of rocking movement of said foot on said bed, substantially as described.

11. A jack-spindle, a foot upon which it is mounted, and a rocker-bed on which said foot is free to rock, combined with a lastpin and an adjustable last pin holder carried by said spindle, and 'means to clamp and retain the last-pin holder in its adjusted position, substantially as described.

" 12. A rocker-bed, a rocking foot mounted thereon and a jack-spindle pivoted on said toot and, provided with a tipable last hold- 1 ing pin, substantially as described.

l3. A rocker-bed, a rocking foot mounted thereon, a jack spindle having its lower end pivoted on said foot centrally between its ends, a last-pin holder at the upper end of said spindle and extended thereabove,

holder. yet leave the pin tree to be readily changed and to be rotated in said holder, substantially as described.

15. In a machine of the class described, a rocker-bed, a rockingdt'oot thereon presenting a part of its underside in the arc of a circle, and a part as av chord to said are, combined with a jack-spindle having a tipping last-pin, substantially as described.

to. In a machine of the class described, a jack-spindle mounted upon a rocking-toot having its underside shaped to present end portions lyino' in the are of a circle, the mi ddle portion or the foot being shaped to present a chord to said arc, and a rocker-bed to sustain said foot, the lower curved side of said :foot occupying the arc of a circle struck from the top of the heel end of the last carried by said spindle, substantially as described.

17. The combination with a tipping jackspindle having a pin to carry a last, of a supporting bed therefor, and a rocking connection between said spindle and bed constructed to attord provision for a movement of the top of the pin in a substantially horizontal plane throughout the driving of a series of slugs or tastenings.

18. The combination with a jack-spindle having a last-pin holder pivoted thereon and provided with worm teeth at its lower end below said pivot, oi an adjustable worm arranged to engage said teeth, and separate means mounted in the spindle and arranged to su iport said worm and relieve the strain on the pivot which sustains the holder.

19. The combination with a jack-spindle and a toothed last-pin holder pivoted thereon and locked at its lower end and provided with a last-pin, of an adjusting device to engage 'the teeth of said holder, means to sust-ain said adjusting device, and means to adjust said sustaining means to insure proper engagement of the adjusting device with the. last-pin holder.

.il. jack composed of a rockingtoot curved at its underside, and a jack-spindle pivoted thereon and movable at right anto the length of said foot, a last-pin mounted on said jack spindle, means to adjust said pin out of line with the longitudinal axis of said spindle, means to lock the last-pin in. its adjusted position, and a bed to sustain the rocking-foot in its rolling motion thereon.

21. in a nailing machine, a foot-plate, a tipping nonrevoluble jack spindle, and sustaining means constructed and arranged with relation to the jack spindle to insure a substantially horizontal movement of a shoe carried by the spindle throughout the tipping movement of the spindle to present different portions of the shoe in position to receive the action of the driver.

22. In a nailing machine, a jack spindle having normally a compound movement made up of a rocking movement in one direction and a tipping movement in another direction constructed and arranged to compensate for vertical variation of the top thereof due to its movement.

In a jack, a rocker-bed, a rocking toot sustained on said bed, and adapted to roll in the direction of its length over the bed during the operation of inserting slugs or tastenings into stock, a j ack-spindle jointed to said rocking-foot between its ends, and means to prevent the lifting of the rockingt'oot from the rocker-bed.

24:. In a nailing machine, a rocker-bed, a rocking-foot, and a jack-spindle pivoted on the toot, said parts having such relation one to the other that a line longitudinally of the jack-s nndle and transversely ol the rocking-toot will intersect said pivot.

25. The con'lbination with a sustaining bed, of a jack-spindle connected thereto, and having provision independent of said connection tor tipping movement, and means to con'ipensate for vertical variation of the top thereof due to the tipping movement of the spindle.

26. In a jack, a bed, a rocking-toot having a curved umlerside sustained by and to rock on said bed, and a jaclespindle joined to said foot and extending therefrom in a direction approximately radial to the curved underside of said foot, its upper end being at substantially the center of the circle of which. said curved underside is approximatcly an arc, whereby a rocking movement of the foot will cause the upper end of the spindle to move in a substantially horizontal path.

27. The combination with a bed, of a jackspindle sustained by and constructed and name to this specification, in the presence of arranged to rock therion during the1 opera- A two subscribing Witnesses.

tion of the driving 0 a series of s ugs or E w i fastenings, and means for preventing a slid- WILLIAM (JUB B ing movement of said spindle relatively to said bed While the former is being rocked. In testimony whereof, I have signed my Witnesses V Nnnsox W. HOWARD, EMMA J. BENNETT. 

